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प्रश्न
Out of Lu(OH)3 and La(OH)3 which is more basic and why?
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उत्तर
- As we move from Ce3+ to Lu3+, the basic character of Lu3+ ions decreases.
- Due to the decrease in the size of Lu3+ ions, the ionic character of the Lu – OH bond decreases, covalent character increases which results in the decrease in the basicity.
- Hence, La(OH)3 is more basic than Lu(OH)3.
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संबंधित प्रश्न
Write the general outer electronic configuration of f- block elements.
Assertion: Ce4+ is used as an oxidizing agent in volumetric analysis.
Reason: Ce4+ has the tendency of attaining +3 oxidation state.
The actinoid elements which show the highest oxidation state of +7 are ____________.
What are inner transition elements?
Justify the position of lanthanides and actinides in the periodic table.
Compare lanthanoids and actinoids.
Why do zirconium and Hafnium exhibit similar properties?
The elements in which electrons are progressively filled in 4f-orbital are called ______.
In the modern periodic table, elements are arranged in order of increasing atomic numbers which is related to the electronic configuration. Depending upon the type of orbitals receiving the last electron, the elements in the periodic table have been divided into four blocks, viz, s, p, d and f. The modern periodic table consists of 7 periods and 18 groups. Each period begins with the filling of a new energy shell. In accordance with the Arfbau principle, the seven periods have 2, 8, 8, 18, 18, 32 and 32 elements respectively. The seventh period is still incomplete. To avoid the periodic table being too long, the two series of f-block elements, called lanthanoids and actinoids are placed at the bottom of the main body of the periodic table.
Which of the elements whose atomic numbers are given below, cannot be accommodated in the present set-up of the long form of the periodic table?
Illustrate by taking examples of transition elements and non-transition elements that oxidation states of elements are largely based on electronic configuration.
